<template>
  <div>
    <!-- 面包屑导航 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>参数列表</el-breadcrumb-item>
    </el-breadcrumb>

    <!-- 卡片视图区域 -->
    <el-card>
      <el-alert title="注意:只允许为第三级分类设置相关参数!" type="warning" show-icon></el-alert>
      <el-row>
        <el-col>
          <span>选择商品分类:</span>
          <!-- 级联选择框 -->
          <el-cascader
            v-model="selectedKeys"
            :options="cateList"
            :props="cateProps"
            @change="handleChange"
            clearable
          ></el-cascader>
        </el-col>
      </el-row>
      <!-- Tab 页签区域 -->
      <el-tabs v-model="activeName" @tab-click="handleTabClick">
        <el-tab-pane label="动态参数" name="many">
          <el-button
            type="primary"
            size="mini"
            :disabled="isBtnDisable"
            @click="addDialogVisible=true"
          >添加参数</el-button>
          <el-table :data="manyTabData" border stripe>
            <el-table-column type="expand">
              <template slot-scope="scope">
                <el-tag
                  v-for="(item,i) in scope.row.attr_vals"
                  :key="i"
                  closable
                  @close="handleClose(i,scope.row)"
                >{{item}}</el-tag>
                <el-input
                  class="input-new-tag"
                  v-if="scope.row.inputVisible"
                  v-model="scope.row.inputValue"
                  ref="saveTagInput"
                  size="small"
                  @keyup.enter.native="handleInputConfirm(scope.row)"
                  @blur="handleInputConfirm(scope.row)"
                ></el-input>
                <el-button
                  v-else
                  class="button-new-tag"
                  size="small"
                  @click="showInput(scope.row)"
                >+ New Tag</el-button>
              </template>
            </el-table-column>
            <el-table-column type="index"></el-table-column>
            <el-table-column label="参数名称" prop="attr_name"></el-table-column>
            <el-table-column label="操作">
              <template slot-scope="scope">
                <el-button
                  type="primary"
                  size="mini"
                  icon="el-icon-edit"
                  @click="showEditDialog(scope.row.attr_id)"
                >编辑</el-button>
                <el-button
                  type="danger"
                  size="mini"
                  icon="el-icon-delete"
                  @click="deleteParamsById(scope.row.attr_id)"
                >删除</el-button>
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
        <el-tab-pane label="静态属性" name="only">
          <el-button
            type="primary"
            size="mini"
            :disabled="isBtnDisable"
            @click="addDialogVisible=true"
          >添加属性</el-button>
          <el-table :data="onlyTabData" border stripe>
            <el-table-column type="expand">
              <el-table-column type="expand">
                <template slot-scope="scope">
                  <el-tag
                    v-for="(item,i) in scope.row.attr_vals"
                    :key="i"
                    closable
                    @close="handleClose(i,scope.row)"
                  >{{item}}</el-tag>
                  <el-input
                    class="input-new-tag"
                    v-if="scope.row.inputVisible"
                    v-model="scope.row.inputValue"
                    ref="saveTagInput"
                    size="small"
                    @keyup.enter.native="handleInputConfirm(scope.row)"
                    @blur="handleInputConfirm(scope.row)"
                  ></el-input>
                  <el-button
                    v-else
                    class="button-new-tag"
                    size="small"
                    @click="showInput(scope.row)"
                  >+ New Tag</el-button>
                </template>
              </el-table-column>
            </el-table-column>
            <el-table-column type="index"></el-table-column>
            <el-table-column label="属性名称" prop="attr_name"></el-table-column>
            <el-table-column label="操作">
              <template slot-scope="scope">
                <el-button
                  type="primary"
                  size="mini"
                  icon="el-icon-edit"
                  @click="showEditDialog(scope.row.attr_id)"
                >编辑</el-button>
                <el-button
                  type="danger"
                  size="mini"
                  icon="el-icon-delete"
                  @click="deleteParamsById(scope.row.attr_id)"
                >删除</el-button>
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
      </el-tabs>
    </el-card>

    <!-- 对话框区域 -->
    <el-dialog
      :title="'添加' + titleText"
      :visible.sync="addDialogVisible"
      width="50%"
      @close="addDialogClosed"
    >
      <el-form ref="addFormRef" :model="addForm" label-width="100px" :rules="addFormRule">
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="addForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="addDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="addParams">确 定</el-button>
      </span>
    </el-dialog>
    <!-- 编辑对话框 -->
    <el-dialog :title="'修改' + titleText" :visible.sync="editDialogVisible" width="50%">
      <el-form ref="editFormRef" :model="editForm" label-width="100px" :rules="editFormRule">
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="editForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="editDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="editParams">确 定</el-button>
      </span>
    </el-dialog>
  </div>
</template>

<script>
export default {
  data() {
    return {
      addDialogVisible: false,
      editDialogVisible: false,
      cateList: [],
      addForm: {},
      selectedKeys: [],
      manyTabData: [],
      onlyTabData: [],
      editForm: [],
      editFormRule: {
        attr_name: [
          { required: true, message: "请输入参数名称", trigger: "blur" }
        ]
      },
      activeName: "many",
      cateProps: {
        value: "cat_id",
        label: "cat_name",
        children: "children",
        expandTrigger: "hover"
      },
      addFormRule: {
        attr_name: [
          { required: true, message: "请输入参数名称", trigger: "blur" }
        ]
      }
    };
  },
  created() {
    this.getCateList();
  },
  computed: {
    isBtnDisable() {
      if (this.selectedKeys.length !== 3) {
        return true;
      }
      return false;
    },

    // 获取三级分类的 Id
    cateId() {
      if (this.selectedKeys.length === 3) {
        return this.selectedKeys[2];
      }
      return null;
    },

    // 动态标题文本
    titleText() {
      if (this.activeName === "many") {
        return "动态参数";
      }
      return "静态属性";
    }
  },
  methods: {
    // 获取全部的分类列表
    async getCateList() {
      const { data: res } = await this.$http.get("categories", {
        params: { type: 3, pagenum: 3, pagesize: 5 }
      });
      if (res.meta.status !== 200) {
        return this.message.error("获取分类数据失败");
      }
      this.cateList = res.data.result;
    },

    // 级联选择器变化时
    handleChange() {
      this.getParamsData();
    },
    async getParamsData() {
      // 如果我们选择的不是三级分类就清空
      if (this.selectedKeys.length !== 3) {
        this.selectedKeys = [];
        return;
      }
      const { data: res } = await this.$http.get(
        `categories/${this.cateId}/attributes`,
        {
          params: { sel: this.activeName }
        }
      );
      if (res.meta.status !== 200) {
        return this.message.error("获取参数列表失败");
      }
      res.data.forEach(item => {
        item.attr_vals = item.attr_vals
          ? (item.attr_vals = item.attr_vals.split(","))
          : [];
        item.inputVisible = false;
        item.inputValue = "";
      });
      if (this.activeName === "many") {
        this.manyTabData = res.data;
      } else {
        this.onlyTabData = res.data;
      }
    },

    // Tab 标签页的点击事件
    handleTabClick() {
      this.getParamsData();
    },

    addDialogClosed() {
      this.$refs.addFormRef.resetFields();
    },

    addParams() {
      this.$refs.addFormRef.validate(async valid => {
        if (!valid) return;
        const { data: res } = await this.$http.post(
          `categories/${this.cateId}/attributes`,
          {
            attr_name: this.addForm.attr_name,
            attr_sel: this.activeName
          }
        );
        if (res.meta.status !== 201) {
          return this.message.error("添加参数失败");
        }
        this.$message.success("添加参数成功");
        this.addDialogVisible = false;
        this.getParamsData();
      });
    },

    // 编辑对话框
    async showEditDialog(id) {
      const { data: res } = await this.$http.get(
        `categories/${this.cateId}/attributes/${id}`,
        {
          params: { attr_sel: this.activeName }
        }
      );
      if (res.meta.status !== 200) {
        return this.message.error("获取参数信息失败");
      }
      this.editForm = res.data;
      this.editDialogVisible = true;
    },

    editParams() {
      this.$refs.editFormRef.validate(async valid => {
        if (!valid) return;
        const { data: res } = await this.$http.put(
          `categories/${this.cateId}/attributes/${this.editForm.attr_id}`,
          {
            attr_name: this.editForm.attr_name,
            attr_sel: this.activeName
          }
        );
        if (res.meta.status !== 200) {
          return this.message.error("修改参数失败");
        }
        this.$message.success("修改参数成功");
        this.getParamsData();
        this.editDialogVisible = false;
      });
    },

    // 利用分类 Id 删除参数
    async deleteParamsById(id) {
      // 弹框询问
      const confirmResult = await this.$confirm(
        "此操作将永久删除该参数,是否继续?",
        "提示",
        {
          confirmButtonText: "确定",
          cancleButtonText: "取消",
          type: "warning"
        }
      ).catch(err => err);
      // 用户选择情况返回 2 种结果
      if (confirmResult !== "confirm") {
        this.$message.info("取消成功");
      } else {
        // TODO 后端请求地址有空格也会导致请求失败(请保持地址原封不动)
        const { data: res } = await this.$http.delete(
          `categories/${this.cateId}/attributes/${id}`
        );
        if (res.meta.status !== 200) {
          return this.$message.error("删除参数失败");
        }
        this.getParamsData();
        this.$message.success("删除参数成功");
      }
    },

    // 添加标签
    async handleInputConfirm(row) {
      if (row.inputValue.trim().length === 0) {
        row.inputValue = "";
        row.inputVisible = false;
        return; // 不合法就跳出操作
      }

      // TODO 无法传递数据到后端(可能是后端路径不对)
      const { data: res } = await this.$http.put(
        `categories/${this.cateId}/attributes/${row.attr_id}`,
        {
          params: {
            attr_id: row.attr_name,
            attr_sel: row.attr_sel,
            attr_vals: row.attr_vals.join(",")
          }
        }
      );
      row.attr_vals.push(row.inputValue.trim());
      row.inputValue = "";
      row.inputVisible = false;
      if (res.meta.status !== 200) {
        return this.message.error("修改参数失败");
      }
      return this.$message.success("修改参数成功");
    },

    showInput(row) {
      row.inputVisible = true;
      this.$nextTick(_ => {
        this.$refs.saveTagInput.$refs.input.focus();
      });
    },

    handleClose(index, row) {
      row.attr_vals.splice(index, 1); // 前端页面处理
      // TODO 提交到后端(前面问题没解决暂时不处理了)
    }
  }
};
</script>

<style lang="less" scoped>
.el-alert {
  margin-bottom: 15px;
}
.el-cascader {
  margin-left: 15px;
}
.el-tabs {
  margin-top: 15px;
}
.el-tag {
  margin-right: 10px;
}
.input-new-tag {
  width: 120px;
}
</style>